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I just started running Thunderbird version 60 and ran into problems with sending and receiving emails. Initially I reported these issues with the Thunderbird team but it was soon discovered that the problem might be antivirus or firewall related. Sure enough, I tried disabling the IMAPS Scanner Setup in EIS and the email client started behaving correctly. Any thoughts on what I can do to re-enable the IMAPS scanner?

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As it turns out, I discovered that when the IMAPS Scanner was enabled, ESET was blocking all connections over port 993. After running a repair on the ESET software installation, the port is no longer blocked and my Thunderbird 60 client works as expected.